Using the data given below, calculate the 3 and 5 years moving averages.
Year
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
Sales
2354
2380
2319
2469
2386
2569
2576
2763
2845
3001
Year
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
Sales
3108
3358
3076
3181
3222
3176
3431
3527
3638
3655
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